Since X is 10, and I is 1, I would think the answer is 21.
The Roman numeral of XXI is equivalent to 21
21
If you mean MMXXI then it is the equivalent of 2021
21 in Roman numerals is XXI (10 + 10 + 1)
XXI = 21
The Roman numeral for 21 is XXI
XXI is the Roman numeral for 21.
XXI
X is 10 and I is 1. XXI is 21.
XXI
21 = XXI
The Roman numeral for 21 is XXI